Korean Journal of Chemical Engineering, Vol.28, No.3, 703-709, March, 2011
Kinetic study on carbonation of crude Li2CO3 with CO2-water solutions in a slurry bubble column reactor
E-mail:
Investigations were conducted to purify crude Li2CO3 via direct carbonation with CO2-water solutions at atmospheric pressure. The experiments were carried out in a slurry bubble column reactor with 0.05 m inner diameter and 1.0 m height. Parameters that may affect the dissolution of Li2CO3 in the CO2-water solutions such as CO2-bubble perforation diameter, CO2 partial pressure, CO2 gas flow rate, Li2CO3 particle size, solid concentration in the slurry, reaction temperature, slurry height in the column and so on were investigated. It was found that the increases of CO2 partial pressure, and CO2 flow rate were favorable to the dissolution of Li2CO3, which had the opposite effects with Li2CO3 particle size, solid concentration, slurry height in the column and temperature. On the other hand, in order to get insight into the mechanism of the refining process, reaction kinetics was studied. The results showed that the kinetics of the carbonation process can be properly represented by 1.3(1.X)2/3+2(1.X)=kt+b, and the rate-determining step of this process under the conditions studied was product layer diffusion. Finally, the apparent activation energy of the carbonation reaction was obtained by calculation. This study will provide theoretical basis for the reactor design and the optimization of the process operation.
- Brown PM, US Patent, 4,036,713 (1977)
- Brown PM, Falletta CE, US Patent, 4,207,297 (1980)
- Amouzegar K, Armant GS and Harrison S, US Patent, 6,048,507 (2000)
- Harrison S, Amouzegar K, Armant GS, US Patent, 20,010,028,871 (2001)
- Armant GS, Amouzegar K, Harrison S, US Patent, NZ504,956 (2002)
- Leutner B (DE), Friedrich H (DE) and Pfeffinger J (DE), US Patent, 6,592,832 (2003)
- Lee DK, Chem. Eng. J., 100(1-3), 71 (2004)
- Fernandez AI, Chimenos JM, Segarra M, Fernandez MA, Espiell F, Hydrometallurgy., 53, 155 (1999)
- Fang F, Li ZS, Cai NS, Korean J. Chem. Eng., 26(5), 1414 (2009)
- Lee SC, Choi BY, Ryu CK, Ahn YS, Lee TJ, Kim JC, Korean J. Chem. Eng., 23(3), 374 (2006)
- Hwang KS, Park SW, Park DW, Oh KJ, Kim SS, Korean J. Chem. Eng., 26(5), 1383 (2009)
- Plummer LN, Wigley TML, Geochim Cosmochim. Acta., 40, 191 (1976)
- Loewenthal RE and Maria GV, Carbonate chemistry of aquatic systems: Theory and applications, vol.1, Ann Arbor, MI (1982)
- Edsall JT, in CO2: Chemical, biochemical, and physiological aspects, Foster RE, Edsall JT, Otis AB and Roughton FJW Eds., NASA, Washington DC (1969)
- Wang TG, Li ZH, Chem. Eng.(China)., 33, 39 (2005)
- Zhang CF, Gas-liquid reaction and reactor., Chemical Industry Press, Beijing (1985)
- Robert CW, Handbook of chemistry and physics, 55th Ed., CRC Press (1974-1975).
- Dodds WS, Stutzman LF, Sollami BJ, Ind. Eng. Chem., Chem. Eng. Data Series., 1, 92 (1956)
- Wang J, Mao Y, Liu YS, Cao R, Chem. Eng. (China)., 34, 28 (2006)
- Zhang SH, Li T, Zhu BC, Zhu ZB, J. Chem. Ind. Eng., 56, 200 (2005)
- Plummer LN, Wigley TML, Parkhurst DL, Critical review of the kinetics of calcite dissolution and precipitation, in: E. A. Jenne (Ed.), Chemical Modeling of Aqueous Systems, American Chemical Society Symposium, Series, 93, 537 (1979)
- Abu-Eishah SI, Anabtawi MJJ, Isaac SL, Chem. Eng. Process., 43(8), 1085 (2004)
- Ma YG, Yang XW, Feng HS, Yu KT, Chem. Eng. (China)., 32, 1 (2004)
- Fu XC, Shen WX and Yao TY, Physical Chemistry, 4th Ed., High Education Press, Beijing (1990)
- Szekely J, Evans JW, Sohn HY, Gas-solid reactions, 1st Ed., Chinese Building Industrial Press, Beijing (1986)
- Guo HX, Applied chemical engineering kinetics, 1st Ed., Chemical Industry Press, Beijing (2003)
- Fan HL, Li CH, Xie KC, Fuel., 81, 91 (2002)